package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;

import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @return
     */
    @Override
    @Transactional
    public Result addEmp(EmployeeDTO employeeDTO) {
        //1.是否账户名为空
        if (employeeDTO.getUsername() == null) {
            return Result.error(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //调用BeanUtils把employeeDTO封装到employee中
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        //添加字段
        //启用或者禁用 1/0
        employee.setStatus(StatusConstant.ENABLE);
        //加密密码
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        /*employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());
        employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId());*/

        //调用dao
        employeeMapper.addEmp(employee);

        return Result.success(employee);
    }


    /**
     * 分页查询员工
     * @param dto
     * @return
     */
    @Override
    public Result pageEmp(EmployeePageQueryDTO dto) {
        //如果传参为空，就给个默认值
        if (dto.getPage()==null){
            dto.setPage(0);
        }
        if (dto.getPageSize() == null) {
            dto.setPageSize(5);
        }

        //分页
        PageHelper.startPage(dto.getPage(),dto.getPageSize());
        //调用dao
        Page<Employee> employees = employeeMapper.pageEmp(dto);
        long total = employees.getTotal();
        List<Employee> result = employees.getResult();

        PageResult pageResult = new PageResult(total,result);

        return Result.success(pageResult);
    }


    /**
     * 修改员工状态
     * @param status
     * @param id
     * @return
     */
    @Override
    public Result updateEmpStatus(Integer status, Long id) {
        //1.非空判断
        if (id == null) {
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        //2.调用mapper接口，修改状态值
        Employee employee = new Employee();
        employee.setStatus(status);
        employee.setId(id);
        /*employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(BaseContext.getCurrentId());*/
        employeeMapper.updateEmp(employee);

        return Result.success(employee);
    }

    /**
     * 通过ID单一查询员工
     */
    @Override
    public Result getById(Long id) {
        //非空判断
        if (id == null) {
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        //调用dao
        Employee employee = employeeMapper.getById(id);
        return Result.success(employee);
    }

    /**
     * 修改员工信息
     * @return
     */
    @Override
    public Result putEmp(EmployeeDTO employeeDTO) {
        //非空判断
        if (employeeDTO.getId()== null){
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        //调用id查询emp对象
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        /*employee.setUpdateUser(BaseContext.getCurrentId());
        employee.setUpdateTime(LocalDateTime.now());*/

        employeeMapper.updateEmp(employee);
        return Result.success(employee);
    }


}
